Sint Maarten, a country within the Kingdom of the Netherlands started issuing postal stamps after the dissolution of the Netherlands Antilles on 10 October 2010. The Island forms one of the five postage regions in the Kingdom. The first stamp issued shows the map of the island Saint Martin.
The value of the current stamp is denominated in Netherlands Antillean guilders.
References
Postage stamps and postal history of Sint Maarten Wikipedia(Text) CC BY-SA